package com.web.servlet;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.fileupload.RequestContext;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.servlet.ServletRequestContext;

public class UploadImgServlet extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;


	/**
	 * Constructor of the object.
	 */
	public UploadImgServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doPost(request,response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {  
	//print request.getInputStream to check request content
	//HttpTool.printStreamContent(request.getInputStream());
     		
     long FILE_MAX_SIZE =1024*1024*10;//10M	
     
     response.setContentType("text/html");
	 response.setCharacterEncoding("utf-8");
	 PrintWriter out = response.getWriter();
	  
     String FILE_SAVE_PATH=request.getSession().getServletContext().getRealPath("/")+"Image/"; //�ϴ��ļ����Ŀ¼
     out.println("FILE_SAVE_PATH="+FILE_SAVE_PATH);
	 RequestContext req = new ServletRequestContext(request);
	if(FileUpload.isMultipartContent(req))
	{
		DiskFileItemFactory factory = new DiskFileItemFactory();
		ServletFileUpload fileUpload = new ServletFileUpload(factory);
		fileUpload.setFileSizeMax(FILE_MAX_SIZE); 
		List<FileItem> items = new ArrayList<FileItem>();
		try 
		{
			items = fileUpload.parseRequest(request);
		} 
		catch(Exception e)
		{
			System.out.print("e=="+e.getMessage());
		    e.printStackTrace();
		}
	    Iterator<FileItem> it = items.iterator();
		while(it.hasNext())
		{
			FileItem fileItem = (FileItem)it.next();
			if(fileItem.isFormField())
			{
				System.out.println(fileItem.getFieldName()+" "+fileItem.getName()+" "+new String(fileItem.getString().getBytes("ISO-8859-1"),"GBK"));
			} 
			else 
			{
				System.out.println("UpLoad file="+fileItem.getFieldName()+" "+fileItem.getName()+" "+
				fileItem.isInMemory()+" "+fileItem.getContentType()+" "+fileItem.getSize());
				if(fileItem.getName()!=null && fileItem.getSize()!=0)
				{
					File fullFile = new File(fileItem.getName());
					File newFile = new File(FILE_SAVE_PATH+fullFile.getName());
					
					try {
							fileItem.write(newFile);
						} 
					catch(Exception e)
					{
						e.printStackTrace();
					}
			    } 
				else 
				{
					out.print("no file choosen or empty file");
					System.out.println("no file choosen or empty file");
				}
			}
		}
	}
	out.flush();
	out.close();
} 
// public void init() throws ServletException {
////��ȡ��web.xml�����õ�init-param   
//FILE_MAX_SIZE = Long.parseLong(this.getInitParameter("file_max_size"));//�ϴ��ļ���С����  
//FILE_SAVE_PATH = this.getInitParameter("file_save_path");//�ļ�����λ��
//} 
  

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
